JSON Schema Generator
JSON Schema generator that infers types, required fields and nested structures from sample JSON data. The output is ready for API documentation and data validation, free in your browser.
Enter JSON to display the schema here.
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Last updated: 2026 · Free online tool
What is JSON Schema Generator?
JSON Schema generator that infers types, required fields and nested structures from sample JSON data. The output is ready for API documentation and data validation, free in your browser.
How to Use
- 1Enter JSON— Paste JSON data on the left.
- 2Select Options— Set the Draft version, include examples, and format detection options.
- 3View Schema— Review the auto-generated JSON Schema on the right and copy it.
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Frequently Asked Questions
JSON Schema Draft-07 and 2020-12 are both supported.
It automatically detects formats like email, URI, date, UUID, and IPv4 in string values and adds the format keyword.
The items schema is generated based on the first element of the array.
All fields that are not null or undefined are included as required.
No. All schema generation is done in the browser.